Percentages, averages and everyday mathematics that are not about money. Finance keeps the loans, tax and interest calculators; this is where the general-purpose maths lives, with the working shown alongside every answer.
6 of 6 tools
Work out any percentage — of a number, as a share, or as a change.
Find the mean, median, mode and range of a list of numbers, with the working shown.
Sample and population standard deviation and variance, both shown, with the working.
Calculate a percentage increase and see the amount it adds.
Calculate a credit-weighted GPA across any number of courses.
Calculate a percentage decrease and the amount it removes.
Create strong random passwords with full control over length and characters.
Format, validate and minify JSON, with errors that point to the exact line.
Count words, characters, sentences and paragraphs as you type.
Turn a logo into favicon.ico, the PNG sizes a site needs, and the HTML to declare them.
Check a downloaded file against its published checksum, without uploading anything.
Stamp text like DRAFT or CONFIDENTIAL across a PDF, in your browser.